Rotor construction.



o. E. LORD. ROTOR CONSTRUCTION. APPLIUATION FILED JUNE 22, 1905 Patented Nov. 3, 1908.

fzventor:

. UNITED .srr 'rEs Pagans? orr ron.

CHARLES E. LORD, OF

NORWOOD, OHIO, ASSIGNOR TO THE BULLOCK ELECTRIC MANUFAC-- TUBING COMPANY, CORPORATION OF OHIO.

ROTOR CONSTRUCTION.

To all whom it may concern. I

,Be it known that I, CHARLEs E. LORD, a citizen of the United States, residing at Norwood, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Rotor Constructions, of

, which the following is a full, clear, and exact The object of my invention isto overcome the difficulties above enumeratedand to pro.

duce a sim le and eflective rotor construction in which-t ere. will be little or no tendency for the centrifugal, and other forces to, displace the pole-pieces or the windings thereon. 4

In carrying out my invention 1 constructthe rotatable element of a dynamo-electric pi ces formed integral therewith, coils, preferably wedge-shaped, surrounding said polepieces, and means for holding said coils in position on said pole-pieces.

The invention further consists of novel dctails and combinations of parts which will be hereinafter described and more particularly pointed out in the appended claims. In the accompanying drawings, which illustrate the preferred embodiment of my invention, Figure 1 is an endelevation partially in section of my improved rotatable element; Fig. 2 is a plan view of one of the assembled pole-pieces; Fig. 3 is a section through the pole-piece and coil on the line 33 of Fig. 2; andFig. 1 is a detail view of one of the wedge-shaped holding pieces.

Referring now to the drawin s, in' which i only the rotatable element of -t e dynamoelectric machine isshown, 5 indicates the hub, preferably formed integral with the shaft 6 having the pole-pieces or poleiece portions 7 integral therewith and proecting radially therefrom. .As' here shown the hub Si can be consideredimerely an en- Specification of Letters Patent. I Application filed June 22, 1905 Serial 266,524.

manner that when ,piece portion 7 is preferably made a i the coil firmly in place i piece entering a longitudinal gchine with a shaft or hub having pole Patented. Nov. 3, 1908.

largement of shaft 6, but may be formed as a separate member, if desired. Surrounding each of said pole-pieces or poleiece ortions 7 is a wedge-shaped coil 8. T is co: ispreferably previousl formed of a strip of -conducting rrateria edgewise wound in such a p aced in position on the ole-piece (as shown in Fi n, 1) the center ines of its sides 8 and 8 wil be in alinenient with the radii 9 and 9 drawn perpendicular to the axis 10 of the rotatable member. The layers or-turns of said coil are preferably so arranged that they will be at right angles to said radii. With this arrangement the centrifugal forces acting along the radial lines 9* and 9 in the directions indicated by the arrow heads will tend to hold the coil in its proper position rather than to displace and distort same. The pole-piece or pol?- itt e smaller than the inner end of the formed coil 8 so vthat said coil may be slipped readily into position over said ole-piece; 'Io hold provide the wedgeshaped holdingpieces 11 which are forced into position (as shown in Fig. 1) between the integral portion 7 of the pole piece and the coil 8, the apex 12 of each wedge-shaped roove 13 formed in the hub 5. Each we ge-shaped piece 11 is provided with the overhanging flanges '14. and 14 against ,which the outer The pieces 11 are held-in place by the keys 15 which. pass end of the coil 8 rests.

through the openings 16 in the flanges 14 and enter the slots 17 and 18 formed in the removable pieces 11 and the integral pieces 7' respectively. Said piecesll may, if desired, be made of non-magnetic material, but are referably of the same magnetic material fiom which the hub and pole-pieces 7 are .made. A spool 19 of insulating material is located between the coil '8 and the integral and separate portions of the polepiece; V

When the rotatable member is rotated at high speed the centrifugal forces acting upon the sides of coil 8 force same against the flanges 14, and the wedge-shaped pieces 11 tendto turn about the key 15 as an axis. Such a turning movement is prevented by the co-ar-tion of the'apexes 12 with the sides ,of grooves 13 and also by the forces acting radially against the flanges 14* which engage the parallel sidesgofjhe coils '8. In asse1nand the-sides of the 'bling my improved rotatable member, the formed coil Sis slipped into position over the pole-piece portion 7 ,then the wedge-shaped pieces 11 are forced into position and finally the keys 15 are driven into the members 7 and ll. .i 3

In the appended claims I aim to cover all modifications of my invention which do not involve a departure from its spirit and scope. Having thus described my invention, what I claim as new and desire to secure by Letters.

Patent is I v 1, In the rotatable element of a dynamoelectric machine, a hub', a pole-piece formed integral with said hub, a wedge-shaped coil surrounding said pole-piece and having the center lines of its sides radial with respect to.

the axis of the rotatable element, and removable wedge-shaped pieces between the polepiece and the sides of the coil.

2. In the rotatable element of a dynamoelectric machine, a hub, a pole-piece formed integral with said hub, a wedge-shaped coil surrounding said ole-piece and having center lines of its sides radial with respect to the axis of the rotatable element, removable wedge-shaped picces between the pole-piece and the sides of the coil, said wedge-shaped pieces having 0ver-l1anging flanges engaging the outer end of said coil, and means for holding said wedge-shaped pieces in position on saidpole-piece. i I

3. In the rotatable element of a dynamo electric machine, a hub, a pole-piece formed integral with said hub, a'wedge-shaped coil surrounding said. pole-piece and having, the center lines of its sides radial wedge-shaped pieces between the pole-piece coil, said wedge-shaped pieces having over-hanging flanges engaging the outer end of said coil, vided with grooves into which the 'apexes of said wedge-shaped pieces project, and keys between the ii'itegral pole-piece and said wedge-shaped pieces.

4. In the rotatable element of a dynamoelectric machine, a-hub, a pole-piece formed integral with said hub, a wedge-shaped coil surrounding said pole-piece and having the ,tially parallel, a ,coil

with respect to the axis of the rotatable element, removable" said hub being procenter lines ol its sides radial with respect to 'the axis of the rotatable element, saidcoil being formed of an edgewise wound strip of conducting material in such a manner that when in position on said ole-'piece'the sev eral turns of said coil will be perpendicular to radii at right angles-to said axis, the formed coil being adapted to he slipped bodily over the end of said integral pole, and

readily removable means located between the coil and the integral pole'piece for holding said coil in position on said pole.

5. In the rotatable element of a dynamoelectric machine, a hub, a poleiece formed integral with said hub, wedgea ed members removably attached to sai integral pole-piece, and a wedge-shaped coil surrounding said pole-piece and having the center lines of its sides radial with'respect to the.

axis, of the rotatable member, said wed eshaped members .being located between t e radial sides of the coil and the integral polepiece.

6. In a rotatable element of a dynamoelectric machine, a rotatable member comprising a hub or core, a ole piece carried by said hub or core, said po 0 piece comprising a member'having its opposite sides substanaving 'two'opposite sides arallel and two sides inclined, said incline sides having center lines substantially radial, and members 11 located between the 'pole-piece and the inclined sides of'said coil.

7. In a rotatable element of a dynamo-.

electric machine, a rotatable member coni- 

